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CBSE Class 11-science Answered

The question is attached above together with part of the solution. Please send the value of x after solving the inequality as above.
Asked by sudhanshubhushanroy | 17 Nov, 2017, 07:40: PM
answered-by-expert Expert Answer
begin mathsize 16px style please space do space check space the space question space it space will space be space cosx space not space cos squared straight x sin 2 straight x greater than cosx space considering space open square brackets 0 comma 2 straight pi close square brackets sin 2 straight x minus cosx greater than 0 cosx left parenthesis 2 sinx minus 1 right parenthesis greater than 0 now space cosx space and space left parenthesis 2 sinx minus 1 right parenthesis space should space have space same space signs cosx greater than 0 space & space space left parenthesis 2 sinx minus 1 right parenthesis space greater than 0 space or space cosx less than 0 space & space space left parenthesis 2 sinx minus 1 right parenthesis space less than 0 for space cosx greater than 0 space & space space left parenthesis 2 sinx minus 1 right parenthesis space greater than 0 cosx space greater than 0 space for space straight x element of open parentheses 0 comma straight pi over 2 close parentheses union open parentheses fraction numerator 3 straight pi over denominator 2 end fraction comma 2 straight pi close parentheses sinx greater than 1 half for space straight x element of open parentheses straight pi over 4 comma fraction numerator 3 straight pi over denominator 4 end fraction close parentheses intersection space straight x element of open parentheses straight pi over 4 comma straight pi over 2 close parentheses similarly space for space cosx less than 0 space & space space left parenthesis 2 sinx minus 1 right parenthesis space less than 0 end style
Answered by Arun | 18 Nov, 2017, 08:57: PM

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